<template>
    <div class="list" ref="wrapper">
        <div>
            <div class="area">
            <div class="title border-topbottom">当前城市</div>
            <div class="button-list">
                <div class="button-wrapper">
                    <p class="button">
                        <!-- {{this.$store.state.city}} -->
                        <!-- {{this.city}} -->
                        {{this.currentCity}}
                    </p>
                </div>
            </div>
            </div>
        <div class="area">
                <div class="title  border-topbottom">热门城市</div>
                <div class="button-list">
                    <div 
                        class="button-wrapper"
                        v-for="item in hotCities" 
                        :key="item.id"
                        @click="handleCityClick(item.name)"
                        >
                        <p class="button">{{item.name}}</p>
                    </div>
                </div>
            </div>
            <div class="area" v-for="(item,key) in cities" :key="item.key" :ref="key">
                <div class="title  border-topbottom">{{key}}</div>
                <div class="item-list">
                    <div 
                        class="item border-bottom"
                         v-for="innerItem in item" :key="innerItem.id"
                         @click="handleCityClick(innerItem.name)"
                        >
                        {{innerItem.name}}
                    </div>             
                </div>
            </div>
        </div>        
    </div>
</template>
<script>
import Bscroll from 'better-scroll';
import {mapState,mapMutations} from 'vuex'
export default {
    name:'cityList',
    props:{
        hotCities:Array,
        cities:Object,
        letter:String
    },
    computed:{//展开运算符
        // ...mapState(['city'])
        ...mapState({
            currentCity:'city'
        })
    },
    mounted(){
        this.scroll=new Bscroll(this.$refs.wrapper);
    },
    //侦听器 监听letter的变化
    watch:{
        letter(){
            if(this.letter){//如果letter发生改变
                const element=this.$refs[this.letter][0];//获得区域
                this.scroll.scrollToElement(element);//自动滚动到元素上
                console.log(element);
            }
            console.log(this.letter);
        }
    },
    methods:{
        handleCityClick(city){
            // this.$store.dispatch('changeCity',city);
            // alert(city);
            // this.$store.commit('changeCity',city);
            this.changeCity(city);
            this.$router.push('/');
        },
        ...mapMutations(['changeCity'])
    }
}
</script>

<style lang="stylus" scoped>
    @import '~@/assets/styles/varibies.styl';
    .border-topbottom
        &:before
            border-color :#ccc
        &:before
            border-color :#ccc
    .title
        line-height:.54rem
        background #eeeeee
        padding-left :.2rem
        font-size :.26rem
        color :#666
    //列表区域没有办法拖拽了 better-scroll
    .list
        overflow :hidden
        position :absolute
        top:1.58rem
        left :0
        right :0
        bottom :0
        .button-list
            padding :.1rem .6rem .1rem .1rem
            overflow hidden
            .button-wrapper
                float :left
                width :33.33%
                .button
                    padding :.1rem 0
                    margin :.1rem
                    text-align :center
                    border :.02rem solid #cccccc
                    border-radius :.06rem
        .item-list
            .item
                line-height :.76rem
                padding-left :.2rem
            .border-bottom
                &:before
                    border-color :#ccc

</style>
